Bearing assembly, motor, and disk drive
a bearing assembly and motor technology, applied in the direction of sliding contact bearings, bearing unit rigid supports, instruments, etc., can solve the problems of sleeve and sleeve housing easily being detached with just small external force, reducing the adhesion strength, and preventing the adhesive from flowing. , the effect of preventing the adhesive from spreading
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first preferred embodiment
[0037]FIG. 1 is a cross-sectional view of a disk drive 1 including an electric spindle motor (hereinafter referred to as a “motor”) according to a first preferred embodiment of the present invention. In this preferred embodiment, the disk drive 1 is a hard disk drive and includes two circular disk-shaped storage media 11 capable of storing data, an access unit 12, the motor 10, and a housing 13. Hereinafter, the disk-shaped storage medium is simply referred to as a “disk”.
[0038]The access unit 12 carries out at least one of writing data on and reading data from the disks 11. The disks 11 spin when the motor 10 rotates. The housing 13 houses the disks 11, the access unit 12, and the motor 10 in its internal space.
[0039]The housing 13 has a first and a second housing members 131 and 132. In this preferred embodiment, the first housing member 131 is approximately cup-shaped, and the second housing member 132 has an approximately plate-like shape. The first housing member 131 has an ope...
second preferred embodiment
[0074]FIG. 9 is a bottom view of a sleeve 42a of a bearing assembly according to a second preferred embodiment of the present invention. In the bearing assembly according to the second preferred embodiment, a recessed portion 4242a centered at the center axis J1 is provided on the lower end surface 424 of the sleeve 42a, instead of the raised portion 4242 of FIG. 6. Except for the above, the configurations of the sleeve 42a and the bearing assembly are approximately the same as those of the sleeve 42 and the bearing assembly 4 shown in FIGS. 4 to 7, and like reference numerals are given to like configurations.
[0075]As on the lower end surface 424 of FIG. 6, a group of a plurality of thrust dynamic pressure grooves 4241, in the form of spiral grooves, for example, are provided on the lower end surface 424 of the sleeve 42a. In FIG. 9, the bottom surfaces of the thrust dynamic pressure grooves 4241 are hatched.
[0076]A thrust dynamic pressure bearing portion is defined by the lower end...
third preferred embodiment
[0092]FIG. 14 shows a portion of a bearing assembly 4b according to a third preferred embodiment. The bearing assembly 4b includes a raised portion 4123 on the top surface 4121 of the step portion 412, instead of the raised portion 4242 of the bearing assembly 4 shown in FIG. 13. The raised portion 4123 of this preferred embodiment is approximately annular and is centered at the center axis J1 (see FIG. 3). Moreover, instead of the radial grooves 661b on the step portion 412 shown in FIG. 13, the bearing assembly 4b includes a plurality of radially extending grooves 661a provided in a rim area of the lower end surface 424 of a sleeve 42b. The grooves 661a form flow passages 66a as the first communicating flow passages that connect the lower gap 63 with the flow passages 65 as the second communicating flow passages. Except for the above, the bearing assembly 4b is approximately the same as the bearing assembly 4′ shown in FIG. 13.
[0093]The bearing assembly 4b shown in FIG. 14 can als...
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